Slate-cleaner



(No Model.)

1?. WITTRAM.

SLATE CLEANER.

No. 336,612. Patented Feb. 23, 1886.

T. QWN M InUE mu 1'."

UNITED STATES PATENT OFFICE.

FREDERICK \VITTRAM, OF SAN FRANCISCO, CALIFORNIA.

SLATE-CLEANER.

.JPECIPICATION forming part of Letters Patent No. 336,612, datedFebruary 23, 1886.

Application filed November 11, 1885. Serial No. 183,517. (No model.)

To all whom it may concern.-

Be it known that I, FREDERICK \VITTRAM, a citizen of the United States,residing in the city and county of San Francisco, State of California,have invented a new and useful Improvement in Slate-Cleaners; and I dohereby declare that the following is a full, clear, and exactdescription of the same, reference being had to the accompanyingdrawings.

My invention relates to devices for removing pencil-marks from slates toproduce a clean surface for repeated use; and it consists in theconstruction and combination of water-reservoir, wet rubber, and dryrubber or eraser, substantially as hereinafter described and set forth.

The body of this device is a flattened tube open at both ends andcapable of holding water. Into one end is fitted a soft porous plug orpiece of material having suflicient porosity to permit the passage ofwater through it when pressed against and drawn over the slate-surface.The other end of the tube is closed by a stopper of harder material,impervious to water, and of such character that its projecting endserves for wiping out or effacing the marks after the wetting process,and also for drying the slate.

Referring to the accompanying drawings by figures and letters, Figure lis an outside view, and Fig. 2 a cross-section taken longitudinallythrough the device.

A is the body, which is formed of a flat tened tube, preferably of tinor other suitable kind of metal. B is the porous rubber, and G thenon-porous block that forms both a stopper and an eraser and drier. Thetube is made somewhat flaring to give a wider opcxr ing for the rubberI), and the edges of the nar row end are turned over or headed. Therubber B may be a piece of line spongeor a piece of felt, and it shouldbe tightly pressed into the tube and secured by turning in the edges ofthe opening or otherwise upsetting the metal. It should also extend intothe tube a considerable way. The part 0, at the opposite end, should bemade of vulcanized rubber, and should be forced into the tube so as toclose its end, and be securely held by its own expansion, suiiicientprojection being afforded beyond the tube to permit the block to bewithdrawn for filling the tube with water, and for furnishing a dryrubbing edge or end to be drawn over the slate without bringing the edgeof the metal in contact with the slate'surface.

Instead of having the piece C removable, it could be permanently fixedin the tube; and to supply the device with water a filling-apertureprovided with a stopper could be made in the side of the tube.

- When intended to be carried in the pocket, the moist end B may becovered by a cap pro vided for the purpose.

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, is

The herein-described device, consist-ingot the waterholding tube A, theporous rubber B in one end, and the nonporous rubber O in the other end,the former constituting a moist rubber, and the latter serving for aharder drying rubber and eraser, substantially as set forth.

FREDERICK \VITTR-AM.

